Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd685f2c1dacf3d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 01:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c34a385a4550acca53a377dcc251e745 SHA-1: 9faa17c56777c6a99ed0ff124190a23d7af35d25 SHA-256: ffd685f2c1dacf3d244929ffd42e622f3123dbc963337c30a078c92e14fb6640
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://herfon-machinery.com/images/ckfinder/files/20210910200458.pdf In PDF document text
    • http://aa-nusd.jp/3510967851.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef026a93e6---sexoluvagokexej.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614581c84490c---80910468508.pdfIn PDF document text
    • http://balalajka.nu/media/69412968245.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/wosiwiwon.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/1235302507.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/41594689523.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/353844378.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/40248840868.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2e03b03dca4f6cd20889f1bb2e3b9241/32120659288.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/22280229496.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/voxabodotepe.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/vikejutibesutulo.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/zupupowiwanuvutokadozedol.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jupinikepabufewapak.pdfIn PDF document text
    • http://sakem.org/userfiles/files/toliwowapozijejitip.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lazepevigagapef.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/nasefedipumadoxaj.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/betivadaranapid.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/40210871915.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xabesirajowoxeb.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161397f16e4dee---51744454911.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/wofor.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nezoboduzozaxovozogeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=carx+drift+racing+online+carsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 10784 bytes
SHA-256: 2dec65f3eaa659b02b4f0295f0b542e2a9d496a1a51c0696eb85b731b83876f9
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 16484 bytes
SHA-256: 12df566a42463bcff645fb830b789874a2c7658483817dc3f4e726ad5718394f

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